Longyearbyen · Svalbard & Jan Mayen

Longyearbyen in September: every year compared

In September, Longyearbyen averages highs of 2.9 °C and lows of 0.3 °C, with 45 mm of precipitation. The warmest September was 2017 (4.8 °C), the coldest 1982 (-4.0 °C).

Avg. highAvg. high 2.9 °C

Avg. lowAvg. low 0.3 °C

PrecipitationPrecipitation 45 mm

Rainy daysRainy days 10

Day by day through September

Normal high and low for each day of September in Longyearbyen.

Normal high and low, day by dayNormal 1991–2020

Every September in Longyearbyen, ranked

86 months of September since 1940. The last one, 2025, ranks 4 of 86 (+2.5 °C vs normal).

194019832025

2025 · 4.1 °C · +2.5 °C vs normal · rank 4 of 86

Warmest years

120174.8 °C
219904.7 °C
320114.2 °C
420254.1 °C
520164.0 °C

Coldest years

11982-4.0 °C
21941-3.0 °C
31968-2.8 °C
41966-2.8 °C
51951-2.6 °C

All 86 years in a table

Year	Mean temperature	Daytime highs	Night lows	Precipitation	Frost days	Snowfall	Rainy days
2025	4.1 °C	5.3 °C	2.9 °C	70 mm	8 days	8 cm	13 days
2024	3.4 °C	4.4 °C	2.2 °C	53 mm	8 days	8 cm	14 days
2023	0.8 °C	1.8 °C	-0.5 °C	62 mm	16 days	15 cm	10 days
2022	3.3 °C	4.3 °C	1.9 °C	64 mm	8 days	16 cm	15 days
2021	3.6 °C	4.6 °C	2.3 °C	67 mm	2 days	9 cm	11 days
2020	2.9 °C	4.0 °C	1.7 °C	72 mm	8 days	10 cm	15 days
2019	2.0 °C	3.3 °C	0.4 °C	61 mm	14 days	27 cm	13 days
2018	1.8 °C	2.9 °C	0.5 °C	40 mm	12 days	10 cm	12 days
2017	4.8 °C	6.1 °C	3.4 °C	50 mm	1 day	3 cm	10 days
2016	4.0 °C	5.3 °C	2.8 °C	69 mm	0 days	9 cm	14 days
2015	2.5 °C	3.7 °C	1.1 °C	63 mm	8 days	14 cm	10 days
2014	1.1 °C	2.4 °C	-0.3 °C	51 mm	15 days	18 cm	12 days
2013	3.7 °C	4.8 °C	2.4 °C	39 mm	4 days	6 cm	10 days
2012	2.6 °C	3.5 °C	1.7 °C	68 mm	7 days	12 cm	14 days
2011	4.2 °C	5.2 °C	3.2 °C	60 mm	3 days	2 cm	16 days
2010	2.3 °C	3.2 °C	1.3 °C	24 mm	6 days	9 cm	8 days
2009	1.8 °C	2.9 °C	0.6 °C	20 mm	12 days	11 cm	5 days
2008	2.9 °C	4.0 °C	1.7 °C	55 mm	7 days	10 cm	12 days
2007	1.2 °C	2.4 °C	0.2 °C	41 mm	13 days	18 cm	8 days
2006	0.3 °C	1.6 °C	-0.9 °C	14 mm	17 days	8 cm	5 days
2005	-0.6 °C	0.5 °C	-2.0 °C	41 mm	22 days	27 cm	11 days
2004	1.7 °C	2.8 °C	0.4 °C	24 mm	14 days	13 cm	6 days
2003	-0.2 °C	1.1 °C	-1.7 °C	35 mm	16 days	12 cm	8 days
2002	-0.9 °C	0.5 °C	-2.5 °C	15 mm	21 days	9 cm	5 days
2001	2.5 °C	3.7 °C	1.3 °C	96 mm	12 days	16 cm	17 days
2000	1.4 °C	3.0 °C	-0.5 °C	65 mm	16 days	9 cm	11 days
1999	2.5 °C	3.7 °C	1.1 °C	94 mm	12 days	18 cm	16 days
1998	0.4 °C	1.7 °C	-0.9 °C	12 mm	20 days	6 cm	2 days
1997	0.5 °C	1.8 °C	-1.1 °C	25 mm	17 days	11 cm	7 days
1996	0.2 °C	1.6 °C	-1.7 °C	62 mm	18 days	22 cm	14 days
1995	1.8 °C	3.1 °C	0.2 °C	42 mm	11 days	22 cm	12 days
1994	-0.2 °C	1.0 °C	-1.7 °C	21 mm	22 days	12 cm	5 days
1993	-0.3 °C	1.0 °C	-1.8 °C	26 mm	20 days	14 cm	7 days
1992	2.4 °C	3.6 °C	0.9 °C	52 mm	9 days	8 cm	12 days
1991	0.1 °C	1.3 °C	-1.4 °C	10 mm	21 days	7 cm	5 days
1990	4.7 °C	5.9 °C	3.4 °C	56 mm	1 day	2 cm	10 days
1989	0.4 °C	1.6 °C	-1.2 °C	59 mm	20 days	20 cm	12 days
1988	-1.7 °C	-0.3 °C	-3.4 °C	31 mm	21 days	15 cm	11 days
1987	-1.1 °C	0.3 °C	-2.6 °C	17 mm	21 days	14 cm	4 days
1986	-1.9 °C	-0.7 °C	-3.3 °C	7 mm	20 days	7 cm	3 days
1985	0.7 °C	1.8 °C	-0.6 °C	45 mm	16 days	27 cm	8 days
1984	1.3 °C	2.6 °C	-0.3 °C	34 mm	14 days	10 cm	9 days
1983	0.8 °C	2.2 °C	-0.7 °C	60 mm	15 days	31 cm	12 days
1982	-4.0 °C	-2.5 °C	-5.7 °C	14 mm	30 days	13 cm	6 days
1981	1.0 °C	2.3 °C	-0.5 °C	69 mm	16 days	23 cm	13 days
1980	1.1 °C	2.3 °C	-0.3 °C	74 mm	17 days	39 cm	15 days
1979	1.2 °C	2.2 °C	-0.2 °C	36 mm	13 days	20 cm	9 days
1978	-2.5 °C	-0.9 °C	-4.2 °C	36 mm	23 days	15 cm	6 days
1977	-0.9 °C	0.5 °C	-2.8 °C	34 mm	24 days	17 cm	9 days
1976	-1.6 °C	-0.2 °C	-3.4 °C	36 mm	26 days	22 cm	11 days
1975	0.5 °C	1.5 °C	-0.7 °C	61 mm	19 days	39 cm	10 days
1974	0.6 °C	1.6 °C	-0.5 °C	45 mm	17 days	26 cm	12 days
1973	0.3 °C	1.7 °C	-0.9 °C	56 mm	20 days	25 cm	16 days
1972	1.7 °C	2.6 °C	0.6 °C	81 mm	9 days	19 cm	14 days
1971	-0.2 °C	0.8 °C	-1.4 °C	38 mm	16 days	17 cm	11 days
1970	-0.0 °C	1.0 °C	-1.2 °C	60 mm	20 days	34 cm	13 days
1969	1.6 °C	2.5 °C	0.5 °C	83 mm	13 days	25 cm	19 days
1968	-2.8 °C	-1.7 °C	-4.0 °C	50 mm	25 days	25 cm	10 days
1967	0.2 °C	1.4 °C	-1.1 °C	74 mm	22 days	30 cm	18 days
1966	-2.8 °C	-1.7 °C	-4.1 °C	21 mm	30 days	15 cm	9 days
1965	-1.4 °C	-0.3 °C	-2.7 °C	17 mm	27 days	9 cm	6 days
1964	-0.8 °C	0.3 °C	-2.1 °C	46 mm	24 days	24 cm	11 days
1963	-1.5 °C	-0.2 °C	-2.9 °C	37 mm	26 days	17 cm	11 days
1962	-2.5 °C	-0.6 °C	-4.7 °C	48 mm	30 days	29 cm	10 days
1961	-1.2 °C	-0.1 °C	-2.7 °C	80 mm	24 days	37 cm	12 days
1960	1.5 °C	2.6 °C	0.2 °C	89 mm	11 days	27 cm	15 days
1959	-0.5 °C	0.7 °C	-2.0 °C	18 mm	25 days	10 cm	5 days
1958	-1.7 °C	-0.2 °C	-3.5 °C	68 mm	23 days	25 cm	17 days
1957	0.6 °C	1.8 °C	-1.1 °C	37 mm	17 days	21 cm	12 days
1956	-1.8 °C	-0.5 °C	-3.4 °C	42 mm	26 days	21 cm	9 days
1955	1.8 °C	2.9 °C	0.4 °C	50 mm	8 days	11 cm	12 days
1954	-0.9 °C	0.2 °C	-2.5 °C	47 mm	23 days	28 cm	10 days
1953	-2.0 °C	-0.6 °C	-3.5 °C	41 mm	27 days	21 cm	11 days
1952	-0.7 °C	0.6 °C	-2.1 °C	45 mm	21 days	23 cm	11 days
1951	-2.6 °C	-1.4 °C	-3.8 °C	25 mm	26 days	15 cm	8 days
1950	-0.2 °C	0.8 °C	-1.4 °C	40 mm	17 days	14 cm	9 days
1949	-2.0 °C	-0.7 °C	-3.3 °C	83 mm	27 days	39 cm	14 days
1948	0.0 °C	1.1 °C	-1.1 °C	101 mm	20 days	46 cm	16 days
1947	-0.5 °C	0.7 °C	-1.8 °C	52 mm	23 days	28 cm	14 days
1946	0.6 °C	1.5 °C	-0.5 °C	29 mm	17 days	5 cm	9 days
1945	-0.3 °C	1.2 °C	-1.9 °C	62 mm	18 days	8 cm	14 days
1944	-0.3 °C	0.8 °C	-1.3 °C	104 mm	18 days	23 cm	17 days
1943	-2.2 °C	-1.2 °C	-3.2 °C	29 mm	22 days	10 cm	9 days
1942	-2.4 °C	-1.3 °C	-3.5 °C	56 mm	23 days	22 cm	11 days
1941	-3.0 °C	-1.8 °C	-4.4 °C	28 mm	26 days	9 cm	11 days
1940	0.2 °C	1.3 °C	-0.9 °C	31 mm	17 days	8 cm	9 days

September records

Hottest day

14.5 °C

September 1, 1990 estimate

Coldest night

-12.5 °C

September 22, 1988 estimate

Wettest day

23 mm

September 27, 1999 estimate

The weather on your birthday in Longyearbyen

Any day since 1940: high, low, rain, snow, and how warm it was compared with the same date in every other year.

Questions & answers

How warm is Longyearbyen in September?

Highs average 2.9 °C and lows 0.3 °C. A typical September brings 0 hot days (30 °C or more) and 13 frost days.

Does it rain a lot in Longyearbyen in September?

About 45 mm falls in September, over some 10 days with at least 1 mm. The wettest September was 1944 (104 mm), the driest 1986 (7 mm).

What was the warmest September in Longyearbyen?

2017, with a mean temperature of 4.8 °C. The coldest was 1982 (-4.0 °C). The last one, 2025, ranks 4 of 86.